1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * "Ping" sockets
8 *
9 * Based on ipv4/ping.c code.
10 *
11 * Authors: Lorenzo Colitti (IPv6 support)
12 * Vasiliy Kulikov / Openwall (IPv4 implementation, for Linux 2.6),
13 * Pavel Kankovsky (IPv4 implementation, for Linux 2.4.32)
14 */
15
16 #include <net/addrconf.h>
17 #include <net/ipv6.h>
18 #include <net/ip6_route.h>
19 #include <net/protocol.h>
20 #include <net/udp.h>
21 #include <net/transp_v6.h>
22 #include <linux/proc_fs.h>
23 #include <net/ping.h>
24
25 /* Compatibility glue so we can support IPv6 when it's compiled as a module */
dummy_ipv6_recv_error(struct sock * sk,struct msghdr * msg,int len,int * addr_len)26 static int dummy_ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
27 int *addr_len)
28 {
29 return -EAFNOSUPPORT;
30 }
dummy_ip6_datagram_recv_ctl(struct sock * sk,struct msghdr * msg,struct sk_buff * skb)31 static void dummy_ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
32 struct sk_buff *skb)
33 {
34 }
dummy_icmpv6_err_convert(u8 type,u8 code,int * err)35 static int dummy_icmpv6_err_convert(u8 type, u8 code, int *err)
36 {
37 return -EAFNOSUPPORT;
38 }
dummy_ipv6_icmp_error(struct sock * sk,struct sk_buff * skb,int err,__be16 port,u32 info,u8 * payload)39 static void dummy_ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
40 __be16 port, u32 info, u8 *payload) {}
dummy_ipv6_chk_addr(struct net * net,const struct in6_addr * addr,const struct net_device * dev,int strict)41 static int dummy_ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
42 const struct net_device *dev, int strict)
43 {
44 return 0;
45 }
46
ping_v6_sendmsg(struct sock * sk,struct msghdr * msg,size_t len)47 static int ping_v6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
48 {
49 struct inet_sock *inet = inet_sk(sk);
50 struct ipv6_pinfo *np = inet6_sk(sk);
51 struct icmp6hdr user_icmph;
52 int addr_type;
53 struct in6_addr *daddr;
54 int oif = 0;
55 struct flowi6 fl6;
56 int err;
57 struct dst_entry *dst;
58 struct rt6_info *rt;
59 struct pingfakehdr pfh;
60 struct ipcm6_cookie ipc6;
61
62 pr_debug("ping_v6_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num);
63
64 err = ping_common_sendmsg(AF_INET6, msg, len, &user_icmph,
65 sizeof(user_icmph));
66 if (err)
67 return err;
68
69 if (msg->msg_name) {
70 DECLARE_SOCKADDR(struct sockaddr_in6 *, u, msg->msg_name);
71 if (msg->msg_namelen < sizeof(*u))
72 return -EINVAL;
73 if (u->sin6_family != AF_INET6) {
74 return -EAFNOSUPPORT;
75 }
76 daddr = &(u->sin6_addr);
77 if (__ipv6_addr_needs_scope_id(ipv6_addr_type(daddr)))
78 oif = u->sin6_scope_id;
79 } else {
80 if (sk->sk_state != TCP_ESTABLISHED)
81 return -EDESTADDRREQ;
82 daddr = &sk->sk_v6_daddr;
83 }
84
85 if (!oif)
86 oif = sk->sk_bound_dev_if;
87
88 if (!oif)
89 oif = np->sticky_pktinfo.ipi6_ifindex;
90
91 if (!oif && ipv6_addr_is_multicast(daddr))
92 oif = np->mcast_oif;
93 else if (!oif)
94 oif = np->ucast_oif;
95
96 addr_type = ipv6_addr_type(daddr);
97 if ((__ipv6_addr_needs_scope_id(addr_type) && !oif) ||
98 (addr_type & IPV6_ADDR_MAPPED) ||
99 (oif && sk->sk_bound_dev_if && oif != sk->sk_bound_dev_if &&
100 l3mdev_master_ifindex_by_index(sock_net(sk), oif) != sk->sk_bound_dev_if))
101 return -EINVAL;
102
103 /* TODO: use ip6_datagram_send_ctl to get options from cmsg */
104
105 memset(&fl6, 0, sizeof(fl6));
106
107 fl6.flowi6_proto = IPPROTO_ICMPV6;
108 fl6.saddr = np->saddr;
109 fl6.daddr = *daddr;
110 fl6.flowi6_oif = oif;
111 fl6.flowi6_mark = sk->sk_mark;
112 fl6.flowi6_uid = sk->sk_uid;
113 fl6.fl6_icmp_type = user_icmph.icmp6_type;
114 fl6.fl6_icmp_code = user_icmph.icmp6_code;
115 security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6));
116
117 ipcm6_init_sk(&ipc6, np);
118 ipc6.sockc.mark = sk->sk_mark;
119 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
120
121 dst = ip6_sk_dst_lookup_flow(sk, &fl6, daddr, false);
122 if (IS_ERR(dst))
123 return PTR_ERR(dst);
124 rt = (struct rt6_info *) dst;
125
126 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
127 fl6.flowi6_oif = np->mcast_oif;
128 else if (!fl6.flowi6_oif)
129 fl6.flowi6_oif = np->ucast_oif;
130
131 pfh.icmph.type = user_icmph.icmp6_type;
132 pfh.icmph.code = user_icmph.icmp6_code;
133 pfh.icmph.checksum = 0;
134 pfh.icmph.un.echo.id = inet->inet_sport;
135 pfh.icmph.un.echo.sequence = user_icmph.icmp6_sequence;
136 pfh.msg = msg;
137 pfh.wcheck = 0;
138 pfh.family = AF_INET6;
139
140 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
141
142 lock_sock(sk);
143 err = ip6_append_data(sk, ping_getfrag, &pfh, len,
144 0, &ipc6, &fl6, rt,
145 MSG_DONTWAIT);
146
147 if (err) {
148 ICMP6_INC_STATS(sock_net(sk), rt->rt6i_idev,
149 ICMP6_MIB_OUTERRORS);
150 ip6_flush_pending_frames(sk);
151 } else {
152 icmpv6_push_pending_frames(sk, &fl6,
153 (struct icmp6hdr *)&pfh.icmph, len);
154 }
155 release_sock(sk);
156
157 dst_release(dst);
158
159 if (err)
160 return err;
161
162 return len;
163 }
164
165 struct proto pingv6_prot = {
166 .name = "PINGv6",
167 .owner = THIS_MODULE,
168 .init = ping_init_sock,
169 .close = ping_close,
170 .connect = ip6_datagram_connect_v6_only,
171 .disconnect = __udp_disconnect,
172 .setsockopt = ipv6_setsockopt,
173 .getsockopt = ipv6_getsockopt,
174 .sendmsg = ping_v6_sendmsg,
175 .recvmsg = ping_recvmsg,
176 .bind = ping_bind,
177 .backlog_rcv = ping_queue_rcv_skb,
178 .hash = ping_hash,
179 .unhash = ping_unhash,
180 .get_port = ping_get_port,
181 .obj_size = sizeof(struct raw6_sock),
182 };
183 EXPORT_SYMBOL_GPL(pingv6_prot);
184
185 static struct inet_protosw pingv6_protosw = {
186 .type = SOCK_DGRAM,
187 .protocol = IPPROTO_ICMPV6,
188 .prot = &pingv6_prot,
189 .ops = &inet6_sockraw_ops,
190 .flags = INET_PROTOSW_REUSE,
191 };
192
193 #ifdef CONFIG_PROC_FS
ping_v6_seq_start(struct seq_file * seq,loff_t * pos)194 static void *ping_v6_seq_start(struct seq_file *seq, loff_t *pos)
195 {
196 return ping_seq_start(seq, pos, AF_INET6);
197 }
198
ping_v6_seq_show(struct seq_file * seq,void * v)199 static int ping_v6_seq_show(struct seq_file *seq, void *v)
200 {
201 if (v == SEQ_START_TOKEN) {
202 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
203 } else {
204 int bucket = ((struct ping_iter_state *) seq->private)->bucket;
205 struct inet_sock *inet = inet_sk(v);
206 __u16 srcp = ntohs(inet->inet_sport);
207 __u16 destp = ntohs(inet->inet_dport);
208 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
209 }
210 return 0;
211 }
212
213 static const struct seq_operations ping_v6_seq_ops = {
214 .start = ping_v6_seq_start,
215 .show = ping_v6_seq_show,
216 .next = ping_seq_next,
217 .stop = ping_seq_stop,
218 };
219
ping_v6_proc_init_net(struct net * net)220 static int __net_init ping_v6_proc_init_net(struct net *net)
221 {
222 if (!proc_create_net("icmp6", 0444, net->proc_net, &ping_v6_seq_ops,
223 sizeof(struct ping_iter_state)))
224 return -ENOMEM;
225 return 0;
226 }
227
ping_v6_proc_exit_net(struct net * net)228 static void __net_exit ping_v6_proc_exit_net(struct net *net)
229 {
230 remove_proc_entry("icmp6", net->proc_net);
231 }
232
233 static struct pernet_operations ping_v6_net_ops = {
234 .init = ping_v6_proc_init_net,
235 .exit = ping_v6_proc_exit_net,
236 };
237 #endif
238
pingv6_init(void)239 int __init pingv6_init(void)
240 {
241 #ifdef CONFIG_PROC_FS
242 int ret = register_pernet_subsys(&ping_v6_net_ops);
243 if (ret)
244 return ret;
245 #endif
246 pingv6_ops.ipv6_recv_error = ipv6_recv_error;
247 pingv6_ops.ip6_datagram_recv_common_ctl = ip6_datagram_recv_common_ctl;
248 pingv6_ops.ip6_datagram_recv_specific_ctl =
249 ip6_datagram_recv_specific_ctl;
250 pingv6_ops.icmpv6_err_convert = icmpv6_err_convert;
251 pingv6_ops.ipv6_icmp_error = ipv6_icmp_error;
252 pingv6_ops.ipv6_chk_addr = ipv6_chk_addr;
253 return inet6_register_protosw(&pingv6_protosw);
254 }
255
256 /* This never gets called because it's not possible to unload the ipv6 module,
257 * but just in case.
258 */
pingv6_exit(void)259 void pingv6_exit(void)
260 {
261 pingv6_ops.ipv6_recv_error = dummy_ipv6_recv_error;
262 pingv6_ops.ip6_datagram_recv_common_ctl = dummy_ip6_datagram_recv_ctl;
263 pingv6_ops.ip6_datagram_recv_specific_ctl = dummy_ip6_datagram_recv_ctl;
264 pingv6_ops.icmpv6_err_convert = dummy_icmpv6_err_convert;
265 pingv6_ops.ipv6_icmp_error = dummy_ipv6_icmp_error;
266 pingv6_ops.ipv6_chk_addr = dummy_ipv6_chk_addr;
267 #ifdef CONFIG_PROC_FS
268 unregister_pernet_subsys(&ping_v6_net_ops);
269 #endif
270 inet6_unregister_protosw(&pingv6_protosw);
271 }
272